Sheet-metal-bending machine



March 18 1924. 1,486,975

' B. J. LINDGREN SHEET METAL BENDING MACHINE Filed Dec 5, 1921 6 Sheets-Sheet 1 'March 18 1924,

B.J.UNDGREN SHEET METAL BENDING MACHINE 5, 1921 6 Sheets-Sheet 2 Filed Dec.

fliv arnegs mam B. J. LINDGREN SHEET METAL BENDING MACHINE March 18 1924.

Filed Dec. 5,1921 6 Sheets-Sheet 5 March 18 1924.

I M mm 6 Sheets-Sheet 5 B.J.UNDGREN SHEET METAL BENDING MACHINE Filed Dec. 5

March 18 1924. 1,486,975

B. J. LINDGREN I SHEET METAL BENDING MACHINE Filed Dec. 5, 1921 6 Sheets-Sheet 6 "atented Mar. 18, 1924.

UNITED STATES PATENT oFFicE.

33 03 J'- LINDGBEN, OF BUFFALO, NEW YORK, ASSIGNOR TO NIAGARA. MACHINE & TOOL WORKS, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

' SHEET-MEIAL-IBENDING KB.

Application filed December 5, 1921. Serial 519,884.

To all whom it may concern: Be it known that I, BROR J. LINDGREN, a citizen of the United States, residing in Buffalo, in the county of Erie and State of 6 New York, have invented new and useful Improvements in Sheet-Metal-Bending Machines, of which the following is a specification.

This invention relates to a machine for bending a sheet of metal into tubular form, and more particularly to a machine of this character which is adapted to bend into tubular form a sheet which has been previously corrugated so that the tube resulting l6 therefrom will have the corrugations extending circumferentially-around the same and may be subsequently converted into a stove pipe elbow.

' It is the ob'ect of this invention to produce a machine whereby such bending may be accomplished effectively, expeditiously and economically and by means which can be easily operated with a minimum expenditure of power and without liability of derangement, as well as permitting of ready adjustment for producing pipes from sheet metal of various diameters and lengths.

In the accompanying drawings: Figure 1 is a sectional elevation of a satisfactory embodiment of my invention, the section being taken on line 1-1, Fig. 2. Figure 2 is a top plan view of the same. Figure 3 is a fragmentary vertical section, taken on line 3-3, Fig. 1. 'Figure l is a side elevation of the machine. Figure 5 is a vertical longitudinal section taken on line 5-5, Fig. 1. Figure 6 is a fragmentary vertical section ta on on line 66, Fig. 13. Figures 7 and 8 are fragmentarysections taken 'on the correspondingly numbered lines in Fig. 6. Figure 9 is a vertical longitudinal section of the machine taken on line 9-9, Fig. 1. Figures 10 and 11 are fragmentary vertical longitudinal sections, on.

an enlarged scale, of the feeding and turning rollers and adjacent parts and showing the manner of operating the same for producing a preliminary bend in the front end of the sheet of metal which is to be bent and the subsequent bending of the same into tubular form. Figure 12 is a fragmentary gitudina of the longitudinal section of the op osing portions of the feeding rollers showing the manner in which they co-operate for gripping a corrugated sheet of metal between the same. Figure 13 is, a fragmentary vertical transverse section, taken on line 1313,

Fig. 2, and showing theparts in the position which they occupy when removing. a

finished sheet metal tube therefrom. Fig-. ure 14: is a fragmentary vertical section, taken on line 14-14, Fig. 4. Figure 15 is a fragmentary longitudinal section taken on line 15-45, Fig. 1. Figures 16, 17, Band 19 are fragmentary sections taken on the correspondingly numbered lines in Fig. 15.

Figure 20. is a perspective view of a complet'e'd corrugated sheet metal'tube which is produced b my improved machine and which ma e converted into a stove pi e elbow. Figure 21 is a fragmentary side eldvation of a machine sho a modified form of the means foradjustmg the turning roller relativeto the feed rollers of the machine. Figure 22 is a front elevation of the same, partly in section. Figure 23 is a fragmentary vertical section, taken on line 2323, Fig. 22. Figure 24 is a fragwhich the sheet of metal 32 which is to be bent into tubular form, is supported preparatory to operating thereon. As shown in Figs. 1 and 9-13, this sheet has been re-' viously' rovided' with a plurality of onfcorrugations 33 and at its rear A edge with a lateral off set 34 and when this machine has completed its operation upon this sheet, the same will be of tubular form with the corrugations extending circumferentially around the same and the off setrear ed thereof overlapping the outer side out edge of the 'sheet, as shown in Fig. 20, ready to be bent into elbow shape means for use as a stove pipe elbow or for other pur oses hen placing this sheet of metal upon the feed table the same is received with its front edge between an upper and a lower feeding roller which are adapted to feed the sheet forwardly, its front edge is adapted to rest upon a turning member which operates to turn the sheet to one side of the ath or direction of the movement at which it reaches the front side of the feed rollers, and the near part of the sheet is conlined in its roper place on the feed table t gages which cause a sheet to he properly presented to the feeding rollers and to he guided while being fed forweirdly during the operation of converting the same into a tum.

ranged adjacent table and capab e edges of the table 31 The preferred means for thus gaging the sheet while the same rests upon the food table comprise rear gage 35 preferably H1 toe form of" a her, adapted to the rear of the sheet of metal and wadjusted lengthwise on the tahle for adapting the machine to of different lengths for forming tubes of difierent diameters, this adjustment consisting preferably of adjusting bolts 36 arranged at opposite ends of the rear gage bar 35 and adapted to enter one or another of the two longitudinal rows of openings 37 arranged to opposite longitudinal On the left hand side of the feed table is arranged a left hand gage 38 preferably in the "form of a her which is adapm to engage with the leftt hand edge of the sheet of metal which is to he beat and which is capable of transverse adjustment on the feed tahle for adapting the machine to sheets of metal of various widths for producing sheet metal tubes of corresponding length, this adjustment being referably efiected by means of adjusting holts 39 arranged at opposite ends of the gage bar 38 and adapted to engage with one or another of two transverse rows of openings 40, formed in the feed table 31 adjacent to its left hand'edge.

The right band edge of the sheet of metal is adapted to engage with a gage 41 orto the front part of the right hand lon 'tudinal edge of the feed l of transverse adjustment thereon for adapting the same to sheets'of metal. of difi'erent widths for producing tubes of difi'erent lengths, this adjustment being efiected by a pair of adjusting bolts 42 arranged on this gage and adapted to engage with one or another pair of openings 48 arranged in transverse rows on the front part of the table adjacent to the right hand edge of the same.

In order to continue the gaging opera tion of the sheet of metal as the same is converted into a tube and also guide the some rea ers lit simultaneously transversely of the machine 7 for adapting the same for the formation of sheet metal tubes of varying length.

Generall speaking, the upper and lower feeding r0 lers are provided with circumfemntial corrugations, the salient parts or rihs of the corrugations ofone roller being opposite the receding parts of the grooves of the corrugations of the other feed roller the corrugations of the sheet metal heing received between these corrugations, so that these corrugations of the feed rollers register with those of the sheet of metal and produce a grip on'opposite sides of the lattor for causing the sheet of metal to he fed forwardly from the feed table and against the turning member for bending the sheet into tubular form during the normal 0 ration of the machine. In order to ena lo the corrugations of the feeding rollers to engage with the corrugated parts of the of metal and ensure a firm grip thereon for positively feeding the same forwardly without however distorting or changing the formation of the corrugations of the sheet other than converting the same into tubular form, the corrugations of one of these feed ing rollers are made comparatively deep and those on the other feeding roller are made comparatively shallow, so' that when the corrugations of the sheets of metal are gripped by the corrugations of the feeding rollers, the summit of the deep corrugation of one of the feeding rollers and the valley of one of the shallow corrugations of the other reed roller will engage sides of one of the corrugations of the sheet of metal toward one side of the latter, while the summit of each of the shallow corrugations on one of the feeding rollers and the corresponding valley of a deep corrugation on the other roller will be spaced apart from opposite sides of the corrugation of the sheet toward the other side of the. same, as shown in Fig. 12. By this means the sheet of metal will only be gripped on its opposite sides at the alternate corrugations thereofl, instead of over its entire surface, whereby only so much lid Hill

lid

with opposite lid but when the same machine is to e. used for -making circumferentially corrugated.

sheet metal. tubes of different lengths, means are provided'whereby the corrugated area of these feeding rollers may be shortened or lengthened to suit the particular length of tube which is to be manufactured. This is preferably effected by providing the bodies of these feeding rollers, which in effect constitute the shafts of the same, with a sufficient number of permanent integral corrugations 51', 52 for operating upon a minimum number of corrugations which are 'liEely to be used in the formation of a corrugated tubular sheet of metal of minimum length and in addition thereto a plurality of corrugations 53, 54 are removably mounted on the shafts of these feeding rollers, .so as to permit of increasing the corrugations on these rollers more or less, as

required, to suit a correspondingly increased corrugated area on a sheet of metal which is to be bent into a tube. Such removable corrugations are mounted on collars 55, 56 which are'slipped onreduced parts 57, 58 of the upper and lower feed roller shafts adjacent to the permanent corrugations thereon, so that when these removable collars are assembled with the shafts the corrugations on each of these rollers will form a continuous and regular series from one end of the row of corrugations to the other, as

best shown in Fig. 13. Adjacent to the corresponding left ends of the series of permanent corrugations of the feedi rollers, the latter are provided with cylindrical faces 59 and 60 which co-operate' to grip between them the uncorrugated edge portion 61 at one of the longitudinal edges of the sheet of metal which forms one end of the tube, as shown in \Figs. 13 and 20, and adjacent to the right end of the removable corrugations, cylindrical gripping sleeves 62. 63 are mounted upon the reduced parts of these rollers which gripping sleeves receive between thein the uncorrugated portion at the opposite longitudinal edge of the sheet of metal which produces the uncorrugated edge portion 64 at the opposite 'end of the tube, as shown in the same figures. These gripping sleeves and the collars carrying the removable corrugations of the feeding rollers are pressed inwardly for the purpose roller,

- in this figure.

of holding the same in their roper position on the shafts of the upper and lower feeding rollers by means of bearin sleeves 64, 65 arranged on the adjacent en s of these rollers and engaged by clamping screw nuts 66, 67 arranged at the res ective ends of the shafts of these rollers an engaging the outer ends of the bearing sleeves, as best shown in Figs. 13 and 14.

The lower feeding roller is arranged immediately in front of the front edge of the feed table with its upper. surface substantially in line therewith and the same is journaled at that end thereof having the permanent gripping surface 60 in a bearin 68 arranged at the upper end of a 'stan ard 69 rising from the adjacent part of the main frame while the bearingsleeve 65 at the other end of this shaft is journaled in a bearing 70 which is preferably made vertically adjustable so as to permit of bringing the same in the proper position-relative to the upper feeding roller during the normal operative osition of the parts. For this purpose the caring 70 is guided in a vertical way 71 formed in the upper part of a standard 72 rising from the main frame on that side thereof opposite to the standard 69 and a vertical adjusting screw 73 is arranged in a threaded opening in the standard 72 and engaged at its upper end with the underside of the bearing 70 so that by turning thescrew 73 in one direction or the other the lower feeding roller may be tilted up or down at its right hand end for the purpose of bringing the same into proper alinement relative to the upper feeding roller for roducing the proper gripping effect of the eeding rollers on the sheet of metal which is to be converted into a tube.

When the sheet of metal has been converted into a tube, the same surroundsthe upper feeding roller and its lower part is gripped between the upper and lower feeding rollers. In order thereforeto permit of removing the finished tube from the machine, the upper feeding roller is raised preferably at one end thereof, and theraised end is detached from itssupport, as shown in Fig. 13, leaving the space around the raised end of the upper feeding roller unobstructed, so that the finished sheet metal tube may be withdrawn lengthwise therefrom, the position of this tube while being thus removed being indicated by dotted lines A practical way for thus operating the upper feeding roller consists in journaling that end of the same opposite to its bearing sleeve 64 in a vertically swinging bearing 74 which latter is formed on a vertically swinging yoke 7 5 having horizontal longitudinal trunnions or pivots 76 on its opposite sides which are journaled in bearings 77 on the upper part of the standard 69, as best shown in Fig. 3.

&

Any suitable means may be provided for turning these feeding rollers so that their -.cooperating opposing surfaces which grip the sheet of metal move forwardly, this being accomplished in the present instance b means of a driving shaft 78 provided wit n driving pinion 79 meshing with a driven gear wheel 88 on the shaft 50 of the lower feeding roller and a air of cooperatin gear pinions 8i, 82 of ike diameter secure respectivel to those ends-of the lower and npper fee ing rollers adjacent to the beer ings 88 end it of the some. The relative arrangement of the ar pinions 821. one 82, is referebly such t at upon lowering the rig t or free hand end of the upper feeding roller the gear pinion 82 will be in mesh witli the. ower gear pinion 8i and cause the two feeding rollers to run inv unison end upon raising the right hand end of the upper feeding roller, the upper gear pinion 82 will remain in mesh with the lower gear pinion 81. The rotation of the feed" ing rollers is stopped while the operator is removing the finished sheet metal tube therefrom.

Power may be supplied to the driving shaft '?(8 in'vnrious via-eyes tor instance, by means oil e power Mt passing around a power pulley 83, mounted on the'driving sliaft '38 end adapted to be connected therewith or disconnected therefrom by means of s clutch 84% which latter is coupled or uncoupled by means or a clutch lever 85 ivoted on the adjacent part of the main name and having its upper arm connected with the clutch 84, as best shown in Figs. 1 and 2i p For the purpose of holding the right hand end of the upper feeding roller reliably in position durin the operation of the machine, but permitting the same to be released and raised to permit of stripping the finished tube therefrom, the following means are provided:

86 and 87 represent the lower and u per sections of a divided bearing block w ich receive between them the bearing sleeve 64 of the upper feeding roller. The lower section 86 is preferably formed integrally with the standard 72 at the upper end thereof and the upper section 87 is preferably so mounted that the same is movable relatively to the lower bearing block section so as to permit of engaging this upper section with or disengaging the same'from the upper side of the bearing sleeve 64. For this pur ose the upper side of the upper bearing block section 87 is provided with an eccentric bearing loop or strap 88 which receives an cecentric 89. This eccentric together with its loop 88 is-arranged between the upper parts of the two yoke bars 90, 91 which are 'arranged on opposite sides of the standard 72 and which are connected at their upper resents feeding roller to be raised, as shown in en tire upper bearing block section 8? is over the bearing sleeve 84 this bearing bloclr section is pressed downwardly so as to confine the bearing sleeve 84% between the same and the lower bearing bloc-lit 88 by turning the eccentric 85) in the proper di reetion for which purpose a horizontal gitndinal shaft 94 is provided which rice the eccentric 89 and is journaled in upper pert of? the. yoke arms 90, 81 end provided edjamnt to tile outer side of yoke arm 98 with the crank arm 95 turning the shaft El-l and the eccentric connected therewith. Means are rovided for lioldin the eccentric 89 yiel ingly in such a position in which the upper bearing block is held against the upper side of the bearing sleeve 8% or released therefrom to permit of swinging the same laterally tbere rorn the preferred means for this purpose shown in the drawings consisting in provid ing the inner side of the hub of the cranls arm 95 with a retaining disk 96 having two recesses 87, 98 on diflerent parts thereof circnmfcrentially of the axis of the short 94 and a spring pressed catch 99 arranged on the ad acent part of the yoke bar 88 and adapted to engage with one-or the other of the recesses 97 or 98 for the purpose of holding the upper bearing block either in its operative or its loosened position.

For the purpose of limitin the upward and inward motion of the o e- 90, 91 and also retaining the same fir y in place when the same and the parts mounted thereon are in their operative position, retaining means may be provided which maybe variously constructed, but which in the present instance consist informing inclined surfaces 100 on the inner sides of the upper the yoke bars 90, 91 and engaging t e same with correspondingly inclined faces 101 on est shown in lllll parts of the upper parts of the outer sides of the standard 72, one pair of these cooperating inclined faces being shown in Fig. 16. By this means a wcdging engagement of the yoke 90, 91 with the standard 72 is produced upon swinging this yoke upwardly into its operative position, whereby these parts are firmly held against fore and aft motion rel ative to each other. The inward and u ward motion of the yoke 90, 91 in this il ficient distance be ondthe crank 95 so as a spring pressed catch 1 03 arranged on the stander 2 engaging with a recess 104 on the'inner side of the adjacent yoke bar 90,

as shown in Figs. 15, 17 and 19. The shaft 94 is preferably extendedrearwardly a sufto serve as a ban e 105 whereby the yoke 75 of the upper feeding roller and thev may be manipulated by one hand for swinging the same upwardly or downwardly into its operative or inoperative position, while the other hand is engaged in manipulating the crank 95 for tightening 0r loosening the upper bearing block 87.

It is preferable to automatically raise the upper feeding roller from the lower feeding roller at the 'same time that the yoke 90, 91 and the parts mounted thereon are moved into their inoperative and operative positions and thus avoid the necessity of separate manipulations for this purpose and expediting the out put of the machine and increasing the capacity of the machine accordingly. For this purpose the yoke 7 5 is provided with a downwardly projectin shifting rock arm 106 which is connect by means of a shifting bar or rod 107 with the front bar 91 of the clamping yoke above the axis of the pivot pin 93. thereof, whereby an outward and downward movement of the yoke 90, 91 will cause the upper feed- ,ing roller to be lifted, as shown in Fig. 13,

while an upward and inward movement of the clamping yoke will cause the upper feeding roller to be lowered, as shown in Fig.1. In order, .however, to permit the clamping yoke to first move laterally sufiicient to carry its upper bearing block clear of. the bearing sleeve 64 of the upper feeding roller before the latter begins-its u ward motion, a slack connection is provide in the shifting means which operatively'onnects the bearing yoke clamp yoke, which slack connection preferably consists of apin 108 arranged 'in'the lower end of the shifting am 106 and work-.

ing in a longitudinal slot 109 in the left hand end of the shiftin rod 107. The formation of this pin and slot connection is such that when the clamping yoke 90, 91 is in its'upper operative position, the pin 108 will be arranged atthe right hand end of the slot 109,'as shown in Fig. 1. If now the clamping yoke 90, 91 is swung outwardl and downwardly the same together wit the shifting bar or rod 107 will move independently .of the upper feeding roller until i the upper bearing block87 is clear of the hearing sleeve 64 and then the left hand end of the slot 109 will engage with the pin 108 so as to cause the shifting arm 106 to move with'the clampin yoke 90, 91 and cause the upper feeding 'ro er to be lifted during the continued outward, and downward movement of the clamping yoke. -In like manner when the clamping yoke is raised'and moved inwardlythe same will move in unison with the upper feedin roller until the. bearing sleeve- 64 of the atter is restin upon the lower bearin block section 86 an thereafter the upwar and inward motion of this clamping yoke will continue while the upper'feedingroller is at rest and thus permit the upper bearing block section to be moved into its operative position and clamped against the upper side of the bearing sleeve y The turning member which intercepts the advancing portion of the sheet of metal as the same issues from between the feedin rollers from the front side thereof is pre erably-constructed in the form of a roller 110 which is provided with a plurality of circumferential corrugations, 111 corresponding to those of the feeding rollers, so as to register with the corrugations'of the sheet of metal which is being operated upon,

said turning roller being arranged horizontally and transversely 1n the path of the sheet of metal and causing the same to be bent or curled upwardl so that when the entire sheet has passed between the rollers,

the front end of the sheet will lap over the ofi' set rear end 34 of this sheet and forms. complete cylinder or-tube therewith, as in dicated by dotted lines in Fig. 9. If the tube has been thus completed, lt'is immaterial whether the feeding rollers continue their engagement with the sheet or tube inasmuch as the-tube will simply continue its turning movement between the feedi rollers under the rotary action of the latter and continue to roll in contact. with the corrugations of the tube and also the overlapping portions thereof without producing any further efl'ect.

In order to permit of varying the position of the turning roller in a vertical direction or perpendicular to the normal path of the sheet as the same issues from the feedin rollers and thus' enable, the lon 'tudina edges of the finished tube to over ap each other properly and also to adapt the machine for making tubes of difi'erent diameters the following means areprovided,

112 represents a cross bar arranged belo the turmng member 110 and provided at its opposite ends with bearings 113 in which the opposite ends of the turning rollervare journaled. 114 represents two upright curved guide arms. each of which is guided in a curved way 115 secured to the adjacent art of the main frame, the curvature of t ese arms and guid'eways being such that the axes are ill

as shown in Fig. 6, so that upon sliding these guide arms on these guide ways, the turning roller 110 will be moved toward or from the mg screw 116 working in lugs 11? on the front sides of these guide arms and bearing against abutment lugs 118 on the adjacent part of the main frame while the downward I movement of the same, after loosening the adjusting screws 116, may be efiected by downward hand pressure on the same. After adjustment, each of these guide arms may be held in position by means of clamping screws 119 secured to each of the curved guides and passing through curved slots 120 in the res ective guide arm, as best shown in Figs. 6, land 8. e

If desired, the turning roller 110 may be raised and lowered relative to the feeding rollers by the means which are shown in Figs. 21-24 and which are constructed as follows: a

121 represents two vertically swingmg shifting arms which are arranged lengthwise in the front part of the machine below the feeding rollers and pivoted by means of pins 221 at the rear ends to the adjacent lower part of the frame while their front ends are connected by means of longitudinal pivot pins 122 wit opposite ends of the cross bar 123 upon which the turning roller 110 is journaled. 124 represents a horizontal operating shaft which is journaled transversely in suitable hearings on the front part of the main frame and provided near its opposite ends with eccentrics 125.

Each of these eccentrics is surrounded by an eccentric. strap 126 which is connected by a rod or pitman 127 with the shifting arm 121 on the corresponding side of the machine. Upon turning the shaft 124 in one direction or the other the turning roller 110 will be raised and lowered, this turning movement being preferably effected by means of a crank arm 128 which is secured to one end of the shaft 124. The swinging movement of the operating arm 128 is effected by means of a crank shaft 129 journaked in the upper end of the operating arm 128 and provided at one end with a gear pinion 130 which meshes with a gear segment 131 on the adjacent part of the main frame concentrically with the axis of the operating shaft 124 and a crank 132 connected with the outer end of the crank shaft 129. By this means a turning movement of the crank arm 132 in either direction will cause the pinion 130 to roll upwardly or downwardly on the segment 131 and thereby shift the o crating arm 121 and the parts associated t erewith so as to raise or lower the turning roller 110 nesaevs relatively to the feeding rollers. For the purpose of lockin the turnin roller in whatever position t e same may 5- adjusted a locking device is rovided which preferably consists' of a loc ing disk 133 arranged on the outer side of the operating arm 128 and provided with an annular row of open= ings 13d, and a spring pressed catch 135 arrand on the handle of the crank arm 132 and adapted to engage with one or another of the openings 134. B turning roller may be easi y shifted into any desired position and then positively held in lace so that the same will operate positively or imparting the roper curvature to the sheet of metal in t e formation of a tube arranged transversely in a slot 137 in the feed table immediately in rear of the feeding rollers. This bar is lowered so that its upper side is flush with the top of the table when the sheet is placed upon the table and between the feeding rollers and with its front and resting upon the turning roller, as shown in Fig. 9. Thereafter the lifting bar is raised slightly so as to lift that portion of the sheet of metal in rear of the feeding rollers, as shown in Fig. 10, whereby an initial bend is produced in the sheet of metal which gives it a definite and permanent set in the direction in which the same is to be curved for converting the same into a tube. Thereafter the lifting bar is again lowered flush with the upper side of the feed table and then the sheet of metal is fed forwardly between the feeding roller and against the turning roller which causes successive parts of the sheet to be curved in the proper direction for causing the advancing end of the sheet to overlap the trailing end thereof and form a complete tube in which the longitudinal ed es thereof overlap each other, as shown y dotted lines in Fig. 9 and by full lines in Fig. 20.

Vertical movement may be imparted to the lifting bar 136 by any suitable means, but

preferably by the means which are shown in the drawmgs and which are constructed as follows:

138 represents a horizontal lifting shaft which is journaled transversely in suitable hearings on the main frame in rear of the lifting bar and provided with forwardly projecting lifting arms 139 which are connected by means of upright links 140 with the underside of the hfting bar adjacent to opposite ends thereof. The upward movethis means the ill) ment of the lifting bar is produced by 136 is guided in its vertical movements by of manufacturing meansof two guide arms 144 projectin downwardl from the underside thereof an each provi ed at its lowericnd with a vertical slot 145 which receives a guide rod 146 arranged horizontall and'transversely on. the adjacent part 0 the mam frame. As the lifting bar 136 rises and falls, the same is compelled to move .in a vertical direction and prevented from tiltingby en-.

gagement of its guide rod 146.

In order to permit the operator to remain constantly at one side of the machine while operating the same during the bending of sheets of metal into tubular form the clutch 84 is operated by means of a handle 147 which is arranged on the same side of the machine as the handles 95 and 105 of the clamping yoke, this clutch operating lever being pivoted at its lower end by means of a pm 148 to the lower end of the main frame and connected by means of a rod 149 with the lower arm of the clutch lever 85, as shown in Figs. 1, 2 and 4.

As a whole, this machine is very eficient and durable in construction and permits of expeditiously bending sheet metal into tubular form with a minimum expenditure of labor and power and thus reducing the cost such articles accordingly. I claim as my invention:

1. A machine of the character described,

guide arms 144 with the 1 comprising a support for the sheet to be bent, upper and lower feeding rollers which receive said sheet from said support, bearings in which'opposite ends of the lower roller are journaled, a vertically swinging bearing in which one end of the upper roller is journaled, a divided bearing in which the other end of said upper roller is journaled, said divided bearing having a fixed lower section, and an upper movable section, a laterally swinging yoke on which said upper bearing section is mounted, and means for turning the sheet as the same issues from said feeding" rollers.

2. A machine of the character described, comprising a support for the sheet to be bent, upper and lower feeding rollers which receive said sheet from said support, bearings in which opposite ends of the lower ro er are journaled, a vertically swingin bearing in which one end of the upper rol er is naled, said divided bearin the other end of said upper roller is jourhaving a fixed lower section and a movab e upper section, a laterally swinging yoke, Ia clamping mechanism whereby said yoke is operatlvely connected with sald'uppe'r bearing section and which operatesto press said upper bearburnaled, a divided bearing in. which ing section'down upon said up er feeding Y ro ler and means for turnin t e sheet as the same issues from said f ing rollers.

3. A machine 'of the character described,

comprising a support for the sheet to be bent, upper and ower feeding rollers which receive said sheet from said support, bearin in which opposite ends of the lower r0 ler are journaled, a vertically swinging bearing in which one end of the upper roller is journaled, a divided bearing in which the otherend of said upper roller'is jour v naled, said divided bearing having a fixed lower sectidn and a movable upper section,

a laterally swinging yoke, an eccentric loop arranged on said upper bearing section, an eccentric enga ing with said eccentricloop, a shaft carrying said eccentric and journaled on said yoke, a clampin whereby said yoke is operativ y connected with said upper bearing section and which operates to press said up 'er bearin section down upon said up er eedingro ler, and means for turning t e sheet as the same issues from said feeding rollers.

mechanism 4. A machine of the character described, A

comprising a support for the sheet to be bent, upper and lower feeding rollers which receive said sheet from said support, bearings in which opposite ends of. the lower roller are journaled, a-vertically swinging bearing in which one end of the upper roller is journaled, a divided bearing in which the said divided bearing h'aving'a fixed lower section anda movable upper section, a.lat erally swinging yoke, an eccentric loop arranged on" said upper bearing section, an eccentric, engaging with said eccentricloop, a shaft carrying said eccentric and "journaled on said yoke, a handle" arranged on said other end of said upper roller is journaled,

shaft, a clamping mechanism whereby said yoke is operatively connected with said upper bearmg sect-ion andwhich operates to press said up er bearing'section down'upon said upper ceding roller,and means for turning the sheet as the same issues from said feeding rollers.

5. A machineof the character described,

comprising a support for the sheet to be bent, upper and lower feeding "rollers which re- I ceive said sheet from said'support, bearings in which opposite ends of the lower roller are journaled, a vertically swinging bearing in which one end of the u per roller is journaled, a divided bearing in which the other shaft a ainst turning, a c amping mechanism w erehy said yoke is operatively con- 'nected with said upper hearing section and which 0 rates to press said upper hearing section own upon said upper fecdm roller,

lid

and means for turnin the sheet as t e same issues from said feeding rollers.

6. A machine of the character described, comprising a su port for the sheet to he bent, upper and ower feeding rollers which receive said sheet from said support, hear= in. in which opposite ends o the lower ro ler are journaled, a vertically swinging hearing in which one end of the upper roller is journaled, a divided hearing in which the other end of said upper roller is journaled,

said divided hearing having a fixed lower section and a movable upper section, a la erally swinging yoke, an eccentric loop arranged on said upper hearing section, an cecentric engaging with said eccentric loop, a

shaft carrying said eccentric and journaled on said yoke, a handle connected with said Eli shaft, a detent disk arranged on said handle and provided with a plurality of recesses, a s ring pressed catch arranged on said yoke and adapted to engage with one or another of said recesses, a clamping mechanism whereby saidyoke is operatively connected with said upper hearing section and which operates to press said up or hearing section down upon said up 1 ceding roller, and means for turning t e sheet as the same issues from said feeding rollers.

7. A machine of the character described, comprising a main frame, a support on said frame for the sheet to be bent, upper and lower feeding rollers which receive said sheet from said support, standards arranged on the main frame and provided at theirupper ends with hearings in which op osite ends of said lower roller are journa ed, a vertically swinging yoke pivoted on one. of said standards and provided with a bearing in which one end of said upper roller is journaled, a divided bearing in which the other end of said upper roller is journaled and which has a lower fixed section mounted on the other standard and an upper movable section which is movable toward and from said lower section, a swinging yoke which carries said upper bearing section, and which has a wedging engagement with the standard on the corresponding side of the machine in the normal position oi the parts, and means for turning said sheet as the same issues from said rollers.

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v 8. machine of? the character described, comprislng a main frame, a support on said frame for the sheet to he beat, upper and lower f rollers which receive said sheet from said support, standards arranged on the main frame and provided at their upper ends with hearin% in which op osite ends of saidlower ro or are journaled, a vertically swinging yolxefivoted on one of said standards an provi ed with a hearing in which one end of said upper roller is journaled, a divided-hearin in which the other end oi said upper role is journaled and which has a lower fined section mounted on the other standard and an upper movahlesection which is movable toward and from said lower section, a swinging yolie which carries said upger hearing section, yielding detent means or couplin. said last mentioned standard and yoke in t e normal position of the parts, and means for turning said sheet as the same issues from said rollers.

9. A machine of the character described, comprising a main frame, a support on said frame for the sheet to be bent, upper and lower feeding rollers which receive s id sheet from said support, standards rranged on the main frame and provided at their upper ends with hearings in which opposits ends of said lower roller are journaled, a vertically swinging yoke pivoted on one of said standards and provided with a hearing in which the end of said upper roller is journaled, a divided hcarin in which the other end of said upper ro ler is journaled and which has a lower fixed section mounted on the other standard and an upper movable section which is movable toward and from said lower section, a swinging yoke which carries said upper hearing sec tion, yielding detent means for con ling said last mentioned standard and yo e in the normal position of the parts comprising a recess in said last mentioned yoke and a spring pressed catch on said last mentioned standard and engaging with said recess, and means for turning said sheet as the same issues from said rollers.

10. A machine of the character described. comprising a main frame, a support on said frame for the sheet to be bent, upper and lower feeding rollers which receive said sheet from said support, standards arranged on the main frame and provided at their upper ends with hearings in which opposite ends of said lower roller are journaled, a vertically swinging yoke pivoted on one of said standards and provided with a bearing in which one end of said A upper roller is journaled, a divided hearing in which the other end of said upper roller is journalcd and which has a lower fixed section mounted on the other standard and an up er movable section which is movable tower and from RED said lower section, a vertically swinging yoke having two side bars which are arranged on opposite sides of the adjacent standard which carries the fixed bearin section and have their lower ends pivot thereto while their upper ends carry between them said movable bearing section, and means for turning said sheet as the same emerges from said feed rollers.

11. A machine of the character described comprisinga main frame, a support on said frame for the sheet to bebent, upper and lower feeding rollers which receive said sheet from said support,standards arranged on the main frame and provided at their upper ends with bearings in which op osite ends of said lower roller are journa ed, a vertically swinging yoke pivoted on one of said standards and provided with a hearing in which one end of said upper roller is journaled, a divided bearing in which the other end of said upper roller is journaled and which has a lower fixed section mounted on the other standard and an upper movable section which is movable toward and from said lower section, a vertically swinging yoke having two side bars which are arranged on opposite sides of the adjacent standard which carries the fixed bearing section and have their lower ends pivoted thereto while their upper ends carry between them said movable bearing section, means for wedgingly engaging said bars with the respective standard in the normal position of the parts, and means for turning said sheet as the same emerges from said feed rollers.

12. A machine of the character described, comprising a main frame, a support on said frame for the sheet to be bent, upper and lower feeding rollers which receive said sheet from said support, standards arranged on the main frame and provided at their upper ends with hearings in which opposite ends of said lower roller are journaled, a

vertically swinging yoke pivoted on one of said standards and provided with a bearing in which one end of said upper roller is journaled, a divided bearing in which the otherendof said upper roller is journaled and which has a lower fixed section mounted on the other standard and an upper movable section which is-movable toward and' from said lower section, a vertically swing ing yoke having two side bars which are arranged on opposite sides of the adjacent standard which carries the fixed bearing section and have their lower ends pivoted thereto while their upper ends carry between them said movable bearing section, a detent device which yieldingly connects one of said bars with the adjacent standard, and means for turning said sheet as the same emerges from said feed rollers.

, emerges from said feed rollers. Y

machine of the character described, comprising a main frame, a support on said frame for the sheet tobe bent, upper and lower feeding rollersfwhich receive said sheet from said support, standards arranged on the main frame and provided at their upper ends with hearings in which opposite ends of said lower roller are journaled, a

vertically swinging yoke pivoted on one of said standards and provided with a bearing in which one end of said upper roller is journaled, a divided bearing in which the other end of said upper roller is journa'led and which has a lower fixed section mounted on the other standard and an upper movable section which is movable toward and from said lower section, a vertically swinging yoke having two side bars which are arranged on opposite sides of the adjacent standard which carries the fixed bearing section and have their lower ends pivoted thereto while their upper Iends carry bele caring section,

tween them said mova means for wedgingly engaging said last mentioned yoke with the adjacent standard, a detent device which yieldingly connects one of said bars with the adjacent standard, and means for turning said sheet as the same 14:. A machine of the character described, comprising upper and lower feeding rollers which receive between them the sheet to be bent, means for turning the sheet as the same issues from said rollers, normally fixed bearings in whichsaid lower roller is journaled, a vertically swinging bearing in which one end of the upper shaft is journaled, adivided bearing in which the other end of said upper shaft is journaled and which has a fixed lower section and a movable upper section, a swinging yoke which carries said upper bearing section, and connecting means between said swinging bearing and said yoke whereby movement of the latter is transmitted to said upper roller.

15. A machine of the character described, comprising upper and lower feeding rollers which receive between them the sheet to be bent, means for turning the sheet as the same issues from said rollers, normally fixed bearings in which said lower roller is journaled, a vertically swinging bearing in which one end of the upper shaft is jour- 16. A machine of the characterdescribed, comprising upper and lower feedmg rollers 'which receive between them the sheet to be between said swinging bearing and said yoke whereby movement of the latter istransmitted to said upper roller comprlsmg an arm projecting downwardly from sald swinging bearing, and a llnk pivotally connected at one end with said yoke wh1le ts opposite end has a slack connection with said arm.

17. A machine of the character described, comprising upper and lower feeding rollers adapted to receive between them the sheet to be bent, a turning roller arranged on the outlet side of said feeding rollers and adapted to intercept said sheet and turn it to one side, and means for adjusting said turning roller in a direction transversely of the path of the sheet as it issues from said feeding rollers comprising a cross bar on which said turning roller is pivotally mounted, acurved arm connected with said cross bar, and acurv'ed guide-which receives said curved arm. 1 18. A machine of the character described, comprising upper and lower feeding rollers 'adapted to receive between them the sheet to be bent, a turningroller arranged on the outlet side of said feeding rollers and adapted to intercept said sheet and turn it to one side, and means for adjusting said turning roller in a direction transversely of the ath of the sheet as it issues from said feedmg rollers comprising a cross bar on which said turning roller is pivotally mounted, a curved arm connected with said cross bar, a .curved guide which receives said curved arm, and a clampin screw on said guide passing through a s ot in said curved arm. r

19. A machine of the character described comprising upper and lower feeding rollers adapted to receive between them the sheet to be bent, a turning roller arranged on the outlet side of said feeding rollers and adapted to intercept said sheet and turn it to one side, and means for adjusting said turning roller in a direction transversely. of the path of the sheet'as it issues from said feeding rollers comprislng a cross bar on which said turning roller is pivotally mounted, a curved arm connected with said cross bar, a curved guide which receives said 1 1 meagre curved arm, and an adjusting screw arranged in said curved arm and engaging with a stationary abutment.

20. A machine of the character described, comprising upper and lower feedin adapted to receive between them t e sheet to be bent, a turning roller arranged on the outlet side of said feeding rollers and adapted to intercept said sheet and turn it to one side, and means for adjusting said turning roller in a direction transversely of the path of the sheet as it issues from said feeding rollers comprising a cross bar on which said turning roller is pivotally mounted, a curved arm connected with said cross bar, a curved guide which receives said curved arm, a clamping screw arranged on said guide and passing through a slot in said curved arm, and an adjusting screw arranged on said curved arm and engaging a fixed abutment.

21. A machine of the character described comprising upper and lower feeding rollers adapted to receive between them the sheet to be bent, a turning roller arranged on the outlet side of said feeding rollers and adapted to intercept said sheet and turn it to one side, and means for adjusting said turning roller in a direction transversely of the ath of the sheet as it issues from said feedlng rollers comprising a cross bar on which said turning roller is pivotally mounted, a rock arm which carries said cross bar, a rocking eccentric, and a shifting rod connected at one end with said cross bar and provided at its other end with a strap surrounding said eccentric.-

22. A machine of the character described, comprising upper and lower feeding rollers adapted to receive between them the sheet to be bent, a turning roller arranged on the outlet side of said feeding rollers and adapted to intercept said sheet and turn it to one side, and means for adjusting said turning roller in a direction transversely of the path of the sheet as it issues from said feeding rollers comprising a cross bar on which said turning roller is pivotally mounted, a rock arm which carries said cross bar, a rocking eccentric, a shifting rod connected at one end with said cross bar and provided at its other end-with a strap surrounding said eccentric, a rocking adjustin arm connected with said eccentric, an means for shifting said rock arm.

23. A machine of the character described, comprising upper and lower feeding rollers adapted to receive between them the sheet to be bent, a turning roller arranged on the outlet side of said feeding rollers and adapted to intercept said sheet and turn it toone side, and means for adjusting said turning roller in a direction transversely of the path of the sheet as it issues from said rollers 1 ,saama feeding rollers comprisin .a cross bar on:

which said turning rol or is pivotally mounted, a rock arm which carries said cross bar, a rocking eccentric, a shifting rod connected at one end with said cross bar and provided at its other end with a strap surrounding said eccentric, a rocking a justing arm connected with .said eccentric, and means for shifting said rock arm comprising a gear pinion pivotally mounted on the outer end of said adjusting arm, and a stationary gear segment with which said pinion meshes.

24. A machine of the character described, comprising upper and lower feeding rollers adapted to receive between them the sheet to be bent, a turning roller arranged on the outlet side of said feeding rollers and adapted to intercept said sheet and turn it to one side, and means for adjusting said turning roller in a direction transversely of the feedmg rollers comprisin a cross bar on which said turning rol er is pivotally mounted, a rock arm which carries said cross bar, a rocking eccentric, a shifting rod connected at one end with said cross bar and provided at its other end with a stra surrounding said eccentric, a rocking a just'mg arm connected with said eccentric, and means for shifting said rock arm comprising a gear pinion pivotally mounted on the outer end of said adjusting arm, a stationary gear segment with which said pinion meshes, a rotary handle connected with said pinion, and means for locking said handle in difierent circumferential positions.

25. A machine of the character described comprising upper andlower feeding rollers adapted to receive between them the sheet to be, bent, a turning roller arranged on the outlet side of said feeding rollers and adapted to intercept said sheet and turn it to one side, and means for adjusting said turning roller in a direction transversely of the path of the sheet as it issues from said feeding rollers comprising a cross bar on which said turning roller is pivotally mounted, a rock arm which carries said cross bar, a rocking eccentric, a'shifting rod connected at one end with said cross bar and provided at its other end with a strap surrounding said eccentric, a rocking adjusting arm connected with said eccentric, and means for shifting said rock arm comprising a gear pinion pivotally mounted on the outer end of said adjusting arm, a stationary gear segment with which said pinion meshes, a rotary handle connected with said pinion, and means for locking said handle in different circumferential positions comprising a look-- ing disk arranged on said adjusting arm and provided with an annular row of openings arranged concentrically with said gear pinion, and a catch movably mounted on ath of the sheet as it issues from said comprising upper and lower feeding rollers which are adapted to receive between them the sheet to be bent, means for turning the sheet as the same issues from the front side" of the rollers, and means for producing an initial upward bend in, the sheet in rear of the feeding rollers.

27. A machine of the character described, comprising upper and lower feeding rollers which are adapted to receive between them the sheet to be bent, means for turning the sheet as the same issues from the front side of the rollers, and means for producing an initial u ward bend in the sheet in rear of the feeding rollers comprising a vertically movable lifting bar normally arranged below the path of the sheet and means for raising said bar.

28. A machine of the character. described comprising upper and lower feeding rollers which, are adapted to receive between them the sheet to be bent, means for turning the sheet as the same issues from the front side of the rollers, and means for producing an initial upward bend in the sheet in rear of the feeding rollers comprising a vertically movable lifting bar' normally arrangedbelow the path of the sheet, means for raising said bar comprising a rock shaft, arms on said rock shaft, and links connecting said 7 rock arms with said lifting bar.

29. A machine of the character described, comprising upper and lower feeding rollers" which are adapted to receive between them the sheet to be bent, means for turning the sheet as the same issues from the front side of the rollers, and means 'for producing an low the path of the sheet, means for raising I said bar comprising a rock shaft, arms on said rock shaft, links connecting said rock' arms with said lifting bar, a hand lever connected with said shaft for raising said bar, a

and means for depressing said bar consisting of a return arm connected with sald shaft, and a spring connecting said return arm with a stationary part.

30. A machine of the character described, comprising upper and lower feedingrollers which are adapted to receive between them the sheet to be bent, means for turning the sheet as the same issues from the front side of the rollers, and means for producing an initial upward bend in the sheet in rear of the feeding rollers comprising a vertically movable lifting bar normally arranged below the path of the sheet, means for raising said bar and means for guiding said bar.

31 A machine of the character described comprising upper and lower feeding rollers 5m s new which are adapted to receive between them low the path of the sheet, means for raising the sheet to be bent, means for turning the said bar, means for guiding said bar comsheet as the same issues from the front side prising a stationary guide bar, and guide W of the rollers, and means for producing an arms secured to the underside of said lifting initial upward bend in the sheet in rear of bar and provided with slots which receive the feeding rollers comprising a vertically said guide rod. r

movable lifting bar normally arranged be- 7 BROR J. LINDGREN. 

